Certainly a biased reading of the philosophers discussed, since the authors are a) looking at the relevance for these historical thinkers in the context of mid-20th-century analytic philosophy, and b) suffer from aforementioned mid-20th-century-analytic-philosophy Lack of Citation Disease.
That being said, I loved how this book looked at 20th century problems of essentialism from different angles and also brought attention back to Aristotle's biology. That such old ideas can still spark so much debate and inspiration for contemporary philosophy of science is truly astounding.
Not the best book if you're not already familiar with these authors (I have never read Frege and I was quite lost in the last section), but a good secondary source for those interested in essentialism, the relationship between particulars and universals (in the Aristotelian tradition), and perhaps even the limits of scientific theory (this one I might just be reading into from the prior two themes due to my personal interests). And as I said in one of my updates, this is probably the most comprehensible interpretation of Aristotle's substances that I've ever read (as a non classicist).